Docs/admin-guide/mm/damon/usage: document for quota goals

Update DAMON sysfs usage for newly added DAMOS quota goals interface.

Link: https://lkml.kernel.org/r/20231130023652.50284-10-sj@kernel.org


Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Brendan Higgins <brendanhiggins@google.com>
Cc: David Gow <davidgow@google.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>